摘要
以山西神磊煤矿150202厚硬基本顶综放工作面为工程背景,开展了切顶卸压无煤柱自成巷技术关键参数优化研究。通过构建切顶后采场上覆岩力学模型,理论分析得出了切顶参数对基本顶未贯通面拉应力的影响规律,即拉应力随切顶高度增加呈近似指数增长,随切顶角度变化呈抛物线分布。基于此,采用3DEC数值模拟软件,研究了不同切顶高度(0~19m)和角度(0°~20°)对留巷顶底板移近量及实体煤帮支承压力的影响。结果表明:增大切顶高度可显著降低留巷围岩变形与应力集中,但超过17m后效果增幅趋缓;切顶角度存在最优区间,15°时卸压效果最佳,角度过大反而会加剧留巷变形。现场试验验证了理论分析与数值模拟结果,确定该工作面最优切顶参数为高度17m、角度15°。研究成果为类似地质条件下切顶成巷技术的应用提供了参考。
Taking the 150202 fully mechanized longwall top coal caving panel with a thick and hard main roof in the Shenlei Coal Mine of Shanxi as the engineering background,this study focuses on optimizing the roof cutting parameters for automatically retained entry in longwall top coal caving panels.A mechanical model of the overburden after roof cutting was constructed to analyze the influence of roof cutting parameters on the tensile stress on the unfractured surface of the main roof.Theoretical analysis revealed that the tensile stress increases approximately exponentially with the roof cutting height and follows a parabolic distribution with changes in the roof cutting angle.Based on this,the effects of different roof cutting heights(0-19 m)and angles(0°-20°)on the convergence of roof and floor,as well as the abutment pressure on the solid coal rib,were investigated using 3DEC numerical simulations.The results show that increasing the roof cutting height significantly reduces surrounding rock deformation and stress concentration;however,this benefit plateaus beyond 17 m.Additionally,there exists an optimal range for the roof cutting angle,with 15°providing the most effective pressure relief.Angles beyond this range tend to exacerbate roadway deformation.Field tests validated the theoretical and numerical findings,confirming that the optimal roof cutting parameters for the panel are a height of 17 m and an angle of 15°.These research results offer valuable guidance for the application of automatically retained entry by roof cutting technology under similar geological conditions.
作者
王浩森
谢猛
钱程
管伟明
冯浩宸
韩小乐
李海鹏
张雪卫
Wang Haosen;Xie Meng;Qian Cheng;Guan Weiming;Feng Haochen;Han Xiaole;Li Haipeng;Zhang Xuewei(School Mining Engineering,Xinjiang University,Urumqi 830017,China;Collaborative Innovation Center for Green Development and Ecological Restoration of Mineral Resources in Xinjiang Autonomous Region and Ministry of Education,Urumqi 830017,China;Xinjiang Sanxin Coal Industry Co.,Ltd.,Yili 835716,China)
出处
《煤炭技术》
2026年第1期46-52,共7页
Coal Technology
基金
新疆生产建设兵团第四师可克达拉市科技计划项目(2025ZR005)
新疆自治区重大科技专项(2024A03001-2)。
关键词
综放工作面
巷道变形
切顶成巷
数值模拟
切顶参数
longwall mining face
roadway deformation
automatically retained entry by roof cutting
numerical simulation
roof cutting parameters
